
The 22-year-old man was sitting in a vehicle with another male about 8:20 p.m. in the 4300 block of South State when two other males armed with handguns walked up and announced a robbery, police said.
The man then pulled out a gun and shot one of the would-be robbers, police said. The male, whose age was not immediately known, was dead at the scene. The other suspect ran away.
The Cook County medical examiner's office could not immediately confirm the death early Thursday.
The man had a valid concealed carry license, according to police. No one else was injured in the shooting.